feat(server): implement chat file TTL cleanup and enhance JPush vendor channel support

Add FileCleanupWorker for automatic expiration of chat files with configurable retention period and batch processing. Files uploaded via `/api/v1/uploads/files` are tracked in `uploaded_files` table with expiration timestamps, then deleted from S3 and database upon expiry. Expired file URLs are injected as `"expired": true` in message responses.

Extend JPush push notification configuration with vendor-specific channel_id support (xiaomi, huawei, oppo, vivo, meizu, honor, fcm) for differentiating system vs chat notifications. Add iOS APNs thread-id grouping configuration for notification categorization.

internal/pkg/jpush/vendor/converters.go

@@ -0,0 +1,156 @@
+package vendor
+
+import (
+	"encoding/json"
+
+	"with_you/internal/config"
+)
+
+// resolveChannelID 按场景选择 channel_id：厂商专属值优先，空则回退到全局默认
+// scene 为 SceneSystem 时取 system 配置，其余取 chat 配置
+func resolveChannelID(scene, vendorSys, vendorChat, defaultSys, defaultChat string) string {
+	if scene == SceneSystem {
+		if vendorSys != "" {
+			return vendorSys
+		}
+		return defaultSys
+	}
+	if vendorChat != "" {
+		return vendorChat
+	}
+	return defaultChat
+}
+
+// channelOnlyMap 仅 channel_id 厂商的通用转换逻辑（厂商空则回退全局默认）
+// 最终 channel_id 为空时返回 nil（不下发该厂商）
+func channelOnlyMap(scene, vendorSys, vendorChat, defaultSys, defaultChat string) map[string]any {
+	cid := resolveChannelID(scene, vendorSys, vendorChat, defaultSys, defaultChat)
+	if cid == "" {
+		return nil
+	}
+	return map[string]any{"channel_id": cid}
+}
+
+// huaweiConverter 华为厂商转换器（仅 channel_id）
+type huaweiConverter struct{}
+
+func (huaweiConverter) VendorName() string { return "huawei" }
+func (huaweiConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	return channelOnlyMap(params.Scene, cfg.Vendor.Huawei.System, cfg.Vendor.Huawei.Chat, cfg.System, cfg.Chat)
+}
+
+// vivoConverter VIVO 厂商转换器（仅 channel_id）
+type vivoConverter struct{}
+
+func (vivoConverter) VendorName() string { return "vivo" }
+func (vivoConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	return channelOnlyMap(params.Scene, cfg.Vendor.VIVO.System, cfg.Vendor.VIVO.Chat, cfg.System, cfg.Chat)
+}
+
+// meizuConverter 魅族厂商转换器（仅 channel_id）
+type meizuConverter struct{}
+
+func (meizuConverter) VendorName() string { return "meizu" }
+func (meizuConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	return channelOnlyMap(params.Scene, cfg.Vendor.Meizu.System, cfg.Vendor.Meizu.Chat, cfg.System, cfg.Chat)
+}
+
+// honorConverter 荣耀厂商转换器（仅 channel_id）
+type honorConverter struct{}
+
+func (honorConverter) VendorName() string { return "honor" }
+func (honorConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	return channelOnlyMap(params.Scene, cfg.Vendor.Honor.System, cfg.Vendor.Honor.Chat, cfg.System, cfg.Chat)
+}
+
+// fcmConverter FCM 厂商转换器（仅 channel_id）
+type fcmConverter struct{}
+
+func (fcmConverter) VendorName() string { return "fcm" }
+func (fcmConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	return channelOnlyMap(params.Scene, cfg.Vendor.FCM.System, cfg.Vendor.FCM.Chat, cfg.System, cfg.Chat)
+}
+
+// xiaomiConverter 小米厂商转换器
+// 配置 mi_template_id 时，私信消息下发时携带 channel_id 及 mi_template_id + mi_template_param
+type xiaomiConverter struct{}
+
+func (xiaomiConverter) VendorName() string { return "xiaomi" }
+
+func (xiaomiConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	x := cfg.Vendor.Xiaomi
+	cid := resolveChannelID(params.Scene, x.System, x.Chat, cfg.System, cfg.Chat)
+	// 小米模板按场景选择
+	templateID := x.MiChatTemplateID
+	if params.Scene == SceneSystem {
+		templateID = x.MiSystemTemplateID
+	}
+
+	// 最终 channel_id 与模板均未配置则跳过
+	if cid == "" && templateID == "" {
+		return nil
+	}
+
+	m := map[string]any{}
+	if cid != "" {
+		m["channel_id"] = cid
+	}
+	if templateID != "" {
+		m["mi_template_id"] = templateID
+		// mi_template_param 为模板参数的 JSON 字符串
+		m["mi_template_param"] = buildMiTemplateParam(params)
+	}
+	return m
+}
+
+// buildMiTemplateParam 生成小米消息模板参数 JSON 字符串
+// 默认占位符：sender / title / content，可按实际小米模板占位符在集中处调整
+func buildMiTemplateParam(params MessageParams) string {
+	param := map[string]any{
+		"sender":  params.SenderName,
+		"title":   params.Title,
+		"content": params.Body,
+	}
+	b, err := json.Marshal(param)
+	if err != nil {
+		return "{}"
+	}
+	return string(b)
+}
+
+// oppoConverter OPPO 厂商转换器
+// 配置 private_msg_template_id 时，私信消息下发时携带 private_msg_template_id + private_title_parameters + private_content_parameters
+type oppoConverter struct{}
+
+func (oppoConverter) VendorName() string { return "oppo" }
+
+func (oppoConverter) Convert(params MessageParams, cfg config.ChannelConfig) map[string]any {
+	o := cfg.Vendor.OPPO
+	cid := resolveChannelID(params.Scene, o.System, o.Chat, cfg.System, cfg.Chat)
+	// OPPO 私信模板按场景选择
+	templateID := o.OppoChatPrivateTemplateID
+	if params.Scene == SceneSystem {
+		templateID = o.OppoSystemPrivateTemplateID
+	}
+
+	if cid == "" && templateID == "" {
+		return nil
+	}
+
+	m := map[string]any{}
+	if cid != "" {
+		m["channel_id"] = cid
+	}
+	if templateID != "" {
+		m["private_msg_template_id"] = templateID
+		// private_title_parameters / private_content_parameters 为 JSONObject
+		m["private_title_parameters"] = map[string]any{
+			"title": params.Title,
+		}
+		m["private_content_parameters"] = map[string]any{
+			"content": params.Body,
+			"sender":  params.SenderName,
+		}
+	}
+	return m
+}